Caple C871i Manual de usuario descargar pdf (Pagina 243)

Apple II Computer Info

screws which secure the power supply. With the screws removed,

turn the computer right-side up. Hold it together when you

do so!

3. Remove the top of the case. NOTE: There are two styles!!

3a. IF THE KEYBOARD IS NOT ATTACHED TO THE UPPER CASE:

i. Set the case lid aside.

ii. The keyboard is attached to two supports attached to the

computer's base pan. Mark the supports at the edge of the

keyboard assembly.

iii. Note the orientation of the ribbon connector either at the

edge of the keyboard, or on the motherboard, and unplug

the ribbon cable.

iv. Remove the four screws which secure the keyboard to the

supports, and remove the keyboard assembly. Proceed to

step 4.

3b. IF THE KEYBOARD IS ATTACHED TO THE UPPER CASE:

i. Note the orientation of the ribbon cable either at the

edge of the keyboard or on the motherboard, and unplug the

ribbon cable. Set the motherboard assembly aside.

ii. Remove the four screws which secure the keyboard to the

upper case and remove the keyboard assembly. Proceed to

step 4.

4. Locate the bad keyswitch, and remove the keycap by pulling

straight up. Also remove the keycaps from the surrounding

keys.

5. On the bottom of the keyboard, there are two solder points

beneath each keyswitch. Locate the solder points for the bad

keyswitch and COMPLETELY desolder the terminals using some

kind of vacuum desoldering tool. I use a squeeze bulb, but

the spring-loaded desoldering tools sometimes work better.

Be careful not to damage the printed circuit trace...do not

overheat the joint!

6. Now for the tough part. Squeeze together the tabs on either

side of the keyswitch post, and lift the keyswitch straight

up out of the keyboard assembly. If it won't come, then you

probably don't have all of the solder off of the connection

posts. Or you aren't squeezing the tabs enough.

7. Align the posts on the bottom of the new keyswitch with the

holes in the circuit board. It will only fit one way.

Press the keyswitch into the keyboard assembly until it

snaps into place.

8. Carefully solder the pins on the keyswitch to the circuit

board. Replace the keycaps.

9a. IF THE KEYBOARD WAS ATTACHED TO THE UPPER CASE:

i. Attach the keyboard to the upper case using the four

screws.

ii. Connect the ribbon cable between the keyboard and the

motherboard

iii. Proceed to step 10.

9b. IF THE KEYBOARD WAS ATTACHED TO SUPPORTS ATTACHED TO THE

BASE PLATE:

Apple II Computer Technical Information : Apple II Family Hardware Info

ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 243 of 572

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